Improvement in machines for sharpening saws



TENT OEEIOE.

NEWTON H. BOLTON, OF OMBO, WISCONSIN.

IMPROVEMENT IN MACHINES FOR SHARPENING SAWS.

Specification forming part of Letters Patent No. 120,700, dated November7, 1871.

To all whom it may concern:

Be it known that I, NEWTON H. BOLTON, of Omro, in the county ofWinnebago and State of Wisconsin, have invented a new and usefulImprovement in Saw-Sharpening Machines; and I do hereby declare thefollowing to be a full, clear,

and exact description thereof, which will en able others skilled in theart to Which my invention appertains to make and use the same, referencebeing had to the accompanying drawing forming part of thisspecification, in Which- Figure 1 is an end vieW of my improved machine,and Fig. 2 is a top view ofthe same.

Similar letters of reference indicate corresponding parts in both guresof the drawing.

My invention relates to a mechanism for sharpening circular or othermill-saws; and to that end consists in a metal frame, Within which issecured a shaft carrying an emery-Wheel so arranged Within a hollowmandrel as to admit of a longitudinal movement simultaneously with arotating movement of the same, whereby the Wheel is adjusted to theteeth, the frame carrying the shaft and mandrel being pivoted to themain frame in a manner which admits of a tilting movement, by which theWheel is adjusted to the dcsired pitch or angle ofthe tooth of the saw.

In the drawing, A is the frame, which may be as shown, or may be made inany manner that Will receive the moving parts of the machine. Firmlyaffixed to the front extremity of said frame are vertical uprights al a,which extend upward slightly above the upper surface ofthe same. To andbetween the said uprights is pivoted a horizontal metal frame, B, theform of which is shown in Fig. 2, and which is so arranged as to admitof atiltin g movement. Within and to the upper surface of the curvedportion of said metal frame is secured ahollowmandrel, O, which is soarranged as to admit of a free and easy rotating movement. Upon saidmandrel is secured a pulley, D, the center of which, laterally with themandrel, is in line with the center ofthe pivots, securing the saidframe to the uprights. Upon and around the said pulley is a belt, d,Which extends backward to and around Wheel D on the main driving-shaftE, which shaft is secured Within boxes c c affixed to the rear and uppersurface of the frame. Mounted upon the outer end of said shaft E is apulley,F, aroundwhich passes a belt (not shown) communicating withsuitable machinery, from which the requisite power for rotating themandrel is Obtained. Loosely affixed Within the said mandrel C is ashaft, C', one end of which is supported Within the box b, secured tothe end of the frame B, the whole being so arranged as to allow the saidshaft a free and easy longitudinal movement. W'ithin that portion of thesaid shaft, passing through the mandrelI provide a longitudinal grooveor seat, which receives a setscreiv, g, secured to and Within themandrel, by which a rotary motion is imparted to the shaft uniform withthe rotation of the mandrel. Loosely secured Ward the main frame, is ametal slide, G, which is so arranged as to admit of a free and easymovement.V Firmly attached to, or formed as a part of said slide, is arack, H, which engages a gear-Wheel, H', affixed to and upon the shaft Isecured to and passing laterally through frame B, and is provided at itsouter end with a crankvvheel, It, for rotating the same, by which meansa reciprocal rectilinear movement may be imparted to the slide by thereciprocalrotary movement of wheel H. Within said slide, near itscenter, is a vertical groove, i, which receives a collar, J, rigidlysecured upon shaft O', by which means alongitudinal movement is impartedto the shaft by the movement of the slide. Mounted upon the outer end ofshaft C is an emery-Wheel, K, the peripherv of which is beveled to anangle near forty-five degrees to its sides, as shown in the drawing.

In using my said improved machine, the frame is arranged in a positionwhich brings the emery-Wheel at a right angle with the saw and in closeproximity to the teeth. A rotary motion is then imparted to the Wheel bythe rotation of shaft O, which motion is communicated thereto fromthcmain driving-wheelD of shaft E, through the medium of belt d, pulley D,and mandrel O, whereby the teeth of the saw are ground to the desirededge and pitch by the contact of the Wheel therewith; the tiltingmovement of the frame carrying the shaft, together with the longitudinalmovement of the shaft, being such as to admit of adjusting the wheel tothe desired point, thus enabling the operator to grind several teethwithout a movement of the saw. It will be noticed that the center of thepulley upon the mandrel is in a line laterally With the pivots to andupon the side of frame B, tov C', slide G, rack, H, and Wheel Hf, asdescribed, whereby a longitudinal movement may be iinparted to the saidshaft C simultaneously With a tilting movement of the same, the Wholearranged to operate the emery-Wheel K, substantially as and for-thepurpose specified.

NEWTON H. BOLTON. Witnesses:

W. S. M. ABBOTT,

E. '.1. ABBOTT. (131)

